There is a hidden message embedded within the below image just below the graphic of Shadow the Hedgehog that cannot be viewed using a normal image viewer. Can you find it?
To find it, you need to use pyrotechnics.
The message is written in one specific font and begins with "I'm".
I'm looking for an answer that also clearly explains the trick I used to obscure the text and why it works. Bonus points for finding the user being referred to by the image.